Mitsubishi Montero (2002-2004). Manual - part 1097

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-5

DIAGNOSTIC TROUBLE CODE CHART

M1353001000033

Follow the inspection chart that is appropriate for the 
diagnostic trouble code.

DIAGNOSTIC 
TROUBLE 
CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

11

Front right ABS sensor

Open circuit or short circuit Refer to GROUP 35B, 

ABS Trouble Code 
Diagnosis 

P.35B-8

.

12

Front left ABS sensor

13

Rear right ABS sensor

14

Rear left ABS sensor

16*

Battery positive voltage

M-ASTC-ECU power 
supply voltage is extremely 
low or high

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-16

.

17

Active skid control switch

Abnormal output signal

P.35C-7

21

Front right ABS sensor

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-20

.

22

Front left ABS sensor

23

Rear right ABS sensor

24

Rear left ABS sensor

25

Incorrect diameter tire

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-32

.

31

Ignition switch (IG2) system

Open circuit

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-18

.

33

Stoplight switch system

Open circuit or ON failure

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-36

.

34

CAN communication system

P.35C-13

35

PCM (engine) system

Abnormal output signal

P.35C-15

36

Communication line with PCM (engine)

P.35C-17

37

PCM (A/T) system

Abnormal output signal

P.35C-15

38

Communication line with PCM (A/T)

P.35C-17

41

Front right control solenoid 
valve

No response to the solenoid 
valve drive signal 
corresponding to the 
respective item

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-43

.

42

Front left control solenoid valve

43

Rear right control solenoid valve

44

Rear left control solenoid valve

45

Front right select solenoid valve

46

Front left select solenoid valve

47

Active traction control system select solenoid valve

P.35C-19

48

Active traction control system select solenoid valve

51

Valve relay system

Short circuit or ON failure

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-58

.

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-6

52

Valve relay system

Open circuit or OFF failure

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-62

.

53

Pump motor

• Seizure of the pump 

motor*

• Abnormality at the 

current detection circuit 
of the M-ASTC-ECU

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-23

.

54

Motor relay

Open circuit, short circuit or 
failure of the motor relay 
coil

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-31

.

55

Pump motor circuit

Pump motor energized 
abnormally for long period*

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-56

.

56

Pressure switch

Open circuit or short circuit Refer to GROUP 35A, 

HBB Trouble Code 
Diagnosis 

P.35A-69

.

57

Accumulator

Accumulator low-pressure 
abnormality*

Refer to GROUP 35A, 
HBB Trouble Code 
Diagnosis 

P.35A-77

.

58

M-ASTC-ECU (Power supply 
drive circuit)

Pump motor drive circuit in 
the M-ASTC-ECU 
abnormality

Replace the M-ASTC-ECU 

P.35C-205

.

61

Master cylinder pressure sensor system

Refer to GROUP 35B, 
ABS Trouble Code 
Diagnosis 

P.35B-71

.

62

G-sensor system

Open circuit or short circuit

P.35C-24

63

G-sensor system

Abnormal output signal

64

G-sensor system

G sensor seized

65

G-sensor system

Trouble in self-diagnosis

66

Steering wheel sensor system

Trouble in self-diagnosis

P.35C-30

67

Steering wheel sensor system

Trouble in communication 
line

P.35C-38

68

Steering wheel sensor system

Abnormal output signal

P.35C-30

71

Yaw rate sensor system

Trouble in self-diagnosis

P.35C-24

72

Yaw rate sensor system

Incorrectly set reference 
value

73

Yaw rate sensor system

Abnormal output signal

74

Abnormal communication of the G and yaw rate sensor

P.35C-46

75

Center differential lock switch

P.35C-52

76

G-sensor system

P.35C-24

77

Yaw rate sensor system

78

Incorrect PCM fitted

P.35C-15

DIAGNOSTIC 
TROUBLE 
CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-7

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC 17: Defective active skid control switch

81

G sensor not initialized

P.35C-56

82

Yaw rate sensor not initialized

83

Steering wheel sensor not initialized

P.35C-57

84

Transfer switch not initialized

P.35C-58

85

Master cylinder pressure sensor not initialized

P.35C-58

DIAGNOSTIC 
TROUBLE 
CODE NO.

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

AC205061

Active Skid Control Switch Circuit

AB

M-ASTC DIAGNOSIS

TSB Revision

MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM

35C-8

.

CIRCUIT OPERATION
If the active skid control switch is turned on, current 
flows from the M-ASTC-ECU terminal 78 through the 
active skid control switch to ground. If the active skid 
control switch is turned off, current flows from the M-
ASTC-ECU terminal 85 through the active skid con-
trol switch to ground.

.

M-ASTC DTC SET CONDITION
DTC 17 is set when the active skid control switch is 
turned on and off simultaneously.

.

TROUBLESHOOTING HINTS
The most likely causes for DTC 17 to set are:

• The active skid control switch is defective.

• Damaged harness wires and connectors

• The M-ASTC-ECU is defective.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan tool (MUT-II)

STEP 1. Check active skid control switch connector E-125.
Q: Is active skid control switch connector E-125 in good 

condition?
YES : Go to Step 2.
NO :  Repair or replace the connector.

AC204176 AI

CONNECTORS: E-06, E-121, E-122, E-125

E-125

E-121

E-06

E-122(L)

AC204176

CONNECTOR: E-125

3

1

4

5

6

2

HARNESS SIDE

AH